Q: Which equation correctly represents the overall process of cellular respiration?

$ \mathrm{C_6H_{12}O_6} + 6\ \mathrm{O_2} \rightarrow 6\ \mathrm{CO_2} + 6\ \mathrm{H_2O} + \text{ATP} $

Question 1

Which statement best describes the First Law of Thermodynamics and its relevance to cellular metabolism?

Accepted Answer

Energy cannot be created or destroyed, only transformed, so cells must convert energy from one form to another during metabolism.

Question 2

A scientist observes that a chemical reaction in a cell releases heat and increases the disorder of the system. According to the Second Law of Thermodynamics, what is this increase in disorder called?

Accepted Answer

Entropy

Question 3

Which of the following best describes the difference between exergonic and endergonic reactions?

Accepted Answer

Exergonic reactions release energy, while endergonic reactions require energy input.

Question 4

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

$ \mathrm{C_6H_{12}O_6} + 6\ \mathrm{O_2} ightarrow 6\ \mathrm{CO_2} + 6\ \mathrm{H_2O} + 	ext{ATP} $

Question 5

Which of the following best explains why the activation energy barrier is critical for life?

Accepted Answer

It prevents all reactions from occurring spontaneously, allowing cells to control when and where reactions happen.

Question 6

Which of the following is true about ATP and its role in cellular metabolism?

Accepted Answer

ATP stores energy in the bonds between its phosphate groups and releases energy when a phosphate is removed.

Question 7

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes act as catalysts, lowering the activation energy and speeding up reactions.

Question 8

A competitive inhibitor affects an enzyme by:

Accepted Answer

Binding to the active site and blocking substrate binding.

Question 9

Which of the following is an example of feedback inhibition in a metabolic pathway?

Accepted Answer

The final product of a pathway binds to an enzyme early in the pathway, decreasing its activity.

Question 10

During glycolysis, which of the following are the main inputs and outputs?

Accepted Answer

Input: glucose; Outputs: pyruvate, ATP, NADH

Question 11

Where does the oxidation of pyruvate to acetyl-CoA occur in eukaryotic cells?

Accepted Answer

In the mitochondrial matrix

Question 12

Why is the citric acid cycle considered a cycle?

Accepted Answer

The final product, oxaloacetate, is regenerated and used to combine with acetyl-CoA to start the cycle again.

Question 13

Which molecule acts as the final electron acceptor in the electron transport chain during oxidative phosphorylation?

Accepted Answer

Oxygen ($ \mathrm{O_2} $)

Question 14

What is the main purpose of fermentation in cells under anaerobic conditions?

Accepted Answer

To regenerate NAD+ from NADH, allowing glycolysis to continue

Question 15

Which of the following correctly matches the reduced and oxidized forms of an energy carrier in cellular respiration?

Accepted Answer

NADH (reduced), NAD+ (oxidized)

Question 16

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which one molecule is oxidized (loses electrons) and another is reduced (gains electrons)

Question 17

Which stage of cellular respiration produces the most ATP?

Accepted Answer

Oxidative phosphorylation

Question 18

Which of the following statements about the use of macromolecules as fuel for cellular respiration is correct?

Accepted Answer

Carbohydrates, fats, and proteins can all be broken down and enter cellular respiration at different points.

Question 19

Which of the following is NOT a product of the citric acid cycle?

Accepted Answer

Glucose

Question 20

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the flow of protons down their gradient to synthesize ATP from ADP and phosphate.

Module 5: The Working Cell and Cellular Respiration – Study Notes

Study Guide - Practice Questions

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